i found that adding a cable between my PCI card and the screw in antenna boosted the signal fourfold. It allowed me to rais the antenna from the back of the pc where there's quite a bit of interference and metal blocking it to above the monitor.
I went from 1 bar to the full 5 and that's just 20 foot from the router.
Walls in the UK are brick though.
And it's a much cheaper option.
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